MOOG G122-824-002

Technical Specifications

• Rated Nominal Flow at 1000 psi Pressure Drop: 19 L/min
• Input Control Signal Standard: ±10 mA analog differential electrical command signal
• Torque Motor Coil Resistance Per Winding: 400 Ω DC nominal
• Hysteresis Rating: ≤ 0.5% full scale input signal
• Threshold Resolution: ≤ 0.1% full scale control input
• Dynamic Response Bandwidth (-3dB): 320 Hz frequency response
• Maximum Supply Hydraulic Pressure: 310 bar continuous operating pressure
• Minimum Return Line Back Pressure: 0 bar; Maximum Back Pressure: 10 bar
• Hydraulic Fluid Viscosity Operating Range: 10 cSt to 100 cSt
• Fluid Operating Temperature Range: -20 °C to +85 °C
• Mounting Interface Standard: ISO 4401 size 03 four-port servo valve manifold mounting pattern

Functional Features

1. Two-stage pilot spool flow amplification with integrated feedback spring arm mechanical spool position feedback
2. Low hysteresis high linearity spool flow characteristic for precision proportional hydraulic control
3. High bandwidth torque motor delivering ultra-fast dynamic motion response
4. Hard chrome plated spool and sleeve assembly for extended abrasive fluid service lifespan
5. Integrated internal fluid filtration screen to prevent particulate contamination spool seizure faults

Material Composition

• Main Valve Body Forging: High-strength aerospace grade aluminum alloy forging
• Spool & Sleeve Assembly: Martensitic stainless steel with hard chrome wear resistant plating
• Torque Motor Magnetic Core: High permeability cobalt iron alloy laminated steel
• Torque Motor Coil Winding: High temperature polyimide insulated copper wire
• Internal Feedback Spring: Elgiloy high fatigue non-magnetic alloy spring steel
• Sealing Components: FKM fluorocarbon high temperature hydraulic fluid resistant elastomer

Structural Characteristics

• Compact monolithic forged valve body with integrated ISO 4401 standard mounting port geometry
• Top-mounted sealed torque motor electromagnetic drive assembly separated from hydraulic fluid chambers
• Internal first-stage pilot nozzle-flapper pilot control stage feeding second-stage main flow spool
• Mechanical cantilever feedback spring linking main spool position back to flapper pilot assembly
• Four hydraulic manifold ports machined into base body: Supply P, Return T, Control A, Control B

Working Principle

Advantage Highlights

1. Ultra-high 320 Hz bandwidth enables high-speed precision closed-loop motion control applications
2. Extremely low hysteresis and threshold resolution delivers micron-level positioning accuracy
3. Aerospace alloy construction provides high mechanical rigidity and reduced valve body weight
4. Hard chrome spool-sleeve plating extends service life in minimally filtered industrial hydraulic fluid systems
5. Standard ISO 4401 mounting interface universal compatibility with global servo manifold hardware

Applicable Industries

Installation Requirements

1. Mount valve flat horizontal on ISO 4401 size 03 standardized hydraulic manifold block
2. Torque manifold mounting bolts to 32 N·m using cross-pattern tightening sequence
3. Install 3 μm absolute inline hydraulic filter upstream of valve supply P port
4. Route control signal shielded twisted pair cable; cable shield single-point grounded at amplifier enclosure
5. Maintain hydraulic fluid temperature within +40 °C to +60 °C nominal operating window

Usage Precautions

1. Do not operate valve with hydraulic fluid contamination exceeding ISO 4406 18/15 cleanliness class
2. Prevent mechanical impact damage to top torque motor sealed housing during installation and maintenance
3. Supply matched ±10 mA differential control signal only; voltage input signals damage torque motor windings
4. Flush full hydraulic circuit for minimum 30 minutes after system assembly before activating closed-loop control
5. Avoid sustained operation at hydraulic fluid temperature exceeding 85 °C to prevent FKM seal degradation